Evaporative cooler



FIG. 1 is a top and right side perspective view of an evaporative cooler showing my new design;

FIG. 2 is a top plan view thereof, on a reduced scale;

FIG. 3 is a bottom plan view thereof, on a reduced scale.

FIG. 4 is a right side elevational view thereof on a reduced scale, and,

FIG. 5 is a left side elevational view thereof, on a reduced scale.

The two side elevational views not shown are each the same respectively of the right and left side elevational views of FIGS. 4 and 5. 

The ornamental design for an evaporative cooler, as shown and described. 